universal-browser-bridge

Item: universal-browser-bridge
Rating: 50
Author: M8ven

Enables MCP-compatible AI agents to securely control Chrome tabs via a local bridge, with explicit per-tab sharing and human approval for consequential actions.

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// key findings

🚨

Known vulnerabilities in dependencies: 1 critical, 4 high

Affects packages this MCP installs at runtime. Upgrade or remove the affected dependency.

🔐

You'll be asked for 1 credential: UBB_TOKEN

These are read from process.env at runtime. Make sure you trust where they’ll be sent.

// known CVEs in dependencies1 critical4 high1 low

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

criticalvitest@3.2.4GHSA-5xrq-8626-4rwp

When Vitest UI server is listening, arbitrary file can be read and executed

high@modelcontextprotocol/sdk@1.17.3GHSA-345p-7cg4-v4c7

@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

high@modelcontextprotocol/sdk@1.17.3GHSA-8r9q-7v3j-jr4g

Anthropic's MCP TypeScript SDK has a ReDoS vulnerability

high@modelcontextprotocol/sdk@1.17.3GHSA-w48q-cv73-mx4w

Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default

highws@8.18.3GHSA-96hv-2xvq-fx4p

ws: Memory exhaustion DoS from tiny fragments and data chunks

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// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

configUBB_ALLOW_PRIVATE_NETWORKS— mcp Set to 1 to allow localhost and private-network navigation

configUBB_CLIENT_LABEL— "": "my-agent"

configUBB_PORT— serve Extension WebSocket port; defaults to 17321

configUBB_SOCKET_PATH— serve, mcp Control socket path; defaults to ~/.universal-browser-bridge/daemon.sock or a Windows named pipe

🔐 secretUBB_TOKEN— serve, mcp, token Supply the token directly instead of reading a file

configUBB_TOKEN_FILE— serve, mcp, token Token path; defaults to ~/.universal-browser-bridge/token

// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 7 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/code-x-coffee-universal-browser-bridge-znekgu)](https://m8ven.ai/mcp/code-x-coffee-universal-browser-bridge-znekgu)

commit: 5d9d39ed95b1c27dc78f0eddc1ff8f7cc39103f2

code hash: dff1a12b202413e54943e1affe9219820aa4b62dab7cd4f174a01a229e359c89

verified: 7/21/2026, 8:54:36 AM

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